Improvement in expansion-gearings



UNITED STATES Piririiwr` @einen LUCIUS I. HOYT, OF AURORA, ILLINOIS, ASSIGNOR TO HOYT & BROTHER MANUFACTURING COMPANY, OF SAME PLACE.

IMPROVEMENT IN EXPANSION-GELARINGS.

Specification forming part of Letters Patent No. 147,398, dated February 10,1874; application tiled October 14, 1873.

To all whom it may concern:

Be it known that I, Lucius l). Herr, of Aurora, in the county of Kane and in the State of Illinois, have invented certain new and useful Improvements in Expansion-Gearing; and do hereby declare that the following is a full, clear, and exact description thereof, reference being had to theaccoinpanying drawings making a part of this specification, in which- Figure 1 is a front elevation of my improved gearing. Fin'. 2 is a side elevation ofthe same.v Fig. 3 is a like view of said gearing with one of the bearing-plates of the ecccntrically-pivoted gear removed, and Fig. 4 is a section of said gear upon line e of Figs. l, 2, and 3.

Letters of like name and kind refer to like parts in each of the figures.

The object of my invention is to enablel parallel rollers or shafts to be geared together in such a manner as to permit of their adjustment toward or from cach other without interference with the said gearing, and it consists, principally, in an internally and externally toothed rim or ring, journaled upon a suitable support and combined with an intern al and an external pinion, in the manner and for the purpose substantially as is hereinafter spccilied. lt consists, further, in the ecccntrically-journaled plates, which form bearings for, and are combined with, the toothed rim or ring, substantially as and for the purpose hereinafter shown. It consists, finally, iii the construction and combination of the toothed ring, piiiions, bearing-plates, and hangers with their shafts, iii the manner and for the purpose substantially as is hereinafter set forth.

ln the annexed drawings, A and B represent two shafts, suitably joui'naled in parallel lilies within supports, and made adjustable toward or from each other. Upon the end of each shaft A and B is secured a toothed pinion, O and D, respectively, which have a like number of teeth, but are not of the saine dimensions, the lower of said pinions D being about seveneighths the diameter of said upper pinion, C. Freni the upper shaft A, upon each side of the pinion G, is pivoted one end of a hanger, E, which extends downward and outward, and has its opposite end pivoted in a like manner to or upon a hub or boss, f, that is placed at the center upon one side of a circular disk, F, each of said hangers being thus attached to a disk, and such points of attachment being upon the outer sides of the saine, so as to leave the inner or adjacent sides of said disks plane and unobstructed. Upon and between the disks F is placed an annular rini or ring, G, which is toothed upon its inner and outer peripheries, and is provided upon or within eacli side with a right-angled groove, g, that embraces a portion of the inner face and the whole of the periphery of the corresponding disk, which latter, thereby, in connection with the opposite disk, formsl a bearing for and upon which said ring may revolve. The lower shaft B passes through a suitable bearing, j", in each disk, F, which bearings are placed ecccntrically at such radial points as to cause the pinion D to mesh with the internal teeth of the rim Cr,whilc the lengths of the hangers are such as to cause the outer series of teeth upon said rini to mesh with the up per pinion O.

As thus constructed and combined, the opA eration of the gearin is as follows: Upon turning the lower shaft B its pinion D will rotate the rim G upon its bearing-plates or disks F, by which movement the pinion C and shaft A will be rotated in an opposite direction, but with the saine velocity-as the said.`

shaft of the lower pinion, and at all times preserve the rela-tive radial positions of the contiguous portions of the pcriplierics of said parts.

As the space between the lieariug-disks is unobstructed an internal pinion, having any relative size that will admit of its operation, may be used within the toothed rim, by which means the relative velocities of the shafts can be varied to suit the occasion.

In addition to the advantage named much larger and stronger pinions can be employed than Would be practicable if the central bearing of the external and internal gear extended from side to side, while the employment of two bearing-disks effectually supports said gearfrom or upon either side, and materially increases its strength and durability.

Having thus fully set forth the nature and merit-s of my invention7 what I claim as new, 1s

l. An internally and externally toothed rim or ring, journaled upon supports and combined with an-internal and an external pinion, substantially as and for the purpose specified.

2. In combination with the toothed rim or rin g (r, the eccentrically-journaled disks F,

fitted into the grooves g of said rim or ring and furnishing a bearing` for and upon which the same revolves, substantially as and for the purpose shown.

3. The toothed rim G, bearing,` plates or disks F, hangers E, pinions C aud D, when constructed, as shown, and combined with each other and with the shafts A and B, in the manner, and for the purpose substantially as shown.

In testimony that I claim the foregoing I have hereunto set my hand this 3d day of October, 1873.

LUC/IUS I. HOYT. Witnesses F. A. BEHER, ISAAC L. HrL'r. 

